A novel stoichiometric controlled multicomponent self-assembly approach has been developed for the construction of unprecedented bicyclic architectures with a high level of constitutional control. As a proof-of-concept, the syntheses, characterization and photophysical properties of a fused metallarhomboid M1 and a triangle M2 have been described (Scheme 1). Both supramolecular coordination complexes (SCCs) consist of a D4h-symmetric tetraphenylethylene (TPE) based tetra-pyridyl donor 1 as the bridging component, a di-pyridyl donor 2 as well as a complementary organoplatinum(II) acceptor 3 or 4. These SCCs display emissions in the aggregated state as well as in dilute solutions; however their difference in the strength and rigidity, as imposed by the shapes, has caused different fluorescence enhancement behaviors. Specifically, M1 shows a weaker fluorescence in dilute solutions as compared to that of M2, while a reversal of emission intensities were observed in the aggregated state. Moreover, by merging the “complex-as-a-ligand’’ strategy and the aforesaid methodology in a single process, the synthesis of unique heterometallic bicyclic architectures has been recently accomplished.

Synthesis and photophysical properties of multicomponent self-assemblies

254th National Meeting (2017)

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